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Few people know that, along with the development of Mi-28 Havok, a second attack helicopter's development, based on Mi- 24, started. It's a deeply modernized version, which had no soldier cabin and with the power-plant placed in special engine nacelle. The helicopter took the code name "Tungus" (Tungus: native people in the Eastern Siberia, Mongolia and North Eastern China).
They call themselves Evenkil (older name "Tungus") and were recognized officially in 1931. They are similar tribe to American Apache).
Actually Mi-37 is a redesigned version which comes after long experience in combat use of the Mi-24 and the latest developments in the helicopters area.
Mi-37 Tungus Attack helicopter.